It's the play that Alabama fans will be talking about for years.

With Alabama having just tied up the national championship game against Clemson in the fourth quarter, Nick Saban's team shocked fans by attempting an onside kick. Kicker Adam Griffith executed perfectly and Marlon Humphrey ran under the ball to give the Crimson Tide the ball and flip the momentum of the game.

Less than a minute later, Jake Coker hit O.J. Howard for a 51-yard touchdown that would give Alabama the lead for good.

But just how good was the onside kick? Nick Saban called it the play he would remember most from this game, and ESPN Sports Science explains the physics behind the play of the year.